Starting April 1, 2010, your Data Transfer Out pricing tier for a given Region will be based on your total Data Transfer Out usage within that region for Amazon S3, Amazon EC2, Amazon SimpleDB, Amazon RDS, Amazon SQS, and Amazon VPC. Until now, usage tiers have been calculated individually for each service, based on data transfer related to that service. Because AWS is now aggregating your total Data Transfer Out usage across multiple services, you can reach higher usage tiers and lower pricing more quickly. In addition, you’ll benefit from a complimentary tier which provides your first GB of outbound transfer in each Region each month at no charge.